单片机系统运行时,东西方向通行,绿灯亮30秒,然后黄灯亮5秒,南北方向通行绿灯亮30秒,黄灯亮5秒。数码管显示倒计时。写出程序
时间: 2024-05-14 21:16:10 浏览: 14
以下是一种可能的基于8051单片机的程序实现:
```
#include <reg52.h> // 引入 8051 单片机寄存器定义头文件
// 定义 I/O 引脚及计时器
sbit EastWestGreen = P1^0;
sbit EastWestYellow = P1^1;
sbit NorthSouthGreen = P1^2;
sbit NorthSouthYellow = P1^3;
sbit DisplayDigit1 = P2^0;
sbit DisplayDigit2 = P2^1;
sbit DisplayDigit3 = P2^2;
sbit DisplayDigit4 = P2^3;
sbit DisplayColon = P2^4;
unsigned int timeRemaining = 0;
unsigned char digitBuffer[4] = {0, 0, 0, 0};
// 定义延时函数,单位为 10ms
void delay10ms(unsigned char count) {
unsigned char i, j;
for (i = 0; i < count; i++) {
for (j = 0; j < 120; j++);
}
}
void main() {
// 初始化计时器和 I/O 引脚
TMOD = 0x01; // 设置计时器 T0 为模式 1,16 位定时器
TH0 = 0xFC; // 设置定时器 T0 初始值为 65536 - 50000,延时 500ms
TL0 = 0x18;
EastWestGreen = 1; // 初始为东西方向通行绿灯
NorthSouthGreen = 0;
DisplayColon = 1; // 显示冒号
while (1) {
// 更新倒计时数字
digitBuffer[0] = timeRemaining / 1000;
digitBuffer[1] = (timeRemaining % 1000) / 100;
digitBuffer[2] = (timeRemaining % 100) / 10;
digitBuffer[3] = timeRemaining % 10;
// 显示倒计时数字
DisplayDigit1 = 0;
P0 = digitBuffer[0];
delay10ms(1);
DisplayDigit1 = 1;
DisplayDigit2 = 0;
P0 = digitBuffer[1];
delay10ms(1);
DisplayDigit2 = 1;
DisplayDigit3 = 0;
P0 = digitBuffer[2];
delay10ms(1);
DisplayDigit3 = 1;
DisplayDigit4 = 0;
P0 = digitBuffer[3];
delay10ms(1);
DisplayDigit4 = 1;
// 每隔 1s 更新倒计时数字
if (TH0 == 0xFC && TL0 == 0x18) {
timeRemaining--;
if (timeRemaining == 0) {
// 绿灯亮 30s,黄灯亮 5s,切换南北方向通行
if (EastWestGreen) {
EastWestGreen = 0;
EastWestYellow = 1;
delay10ms(50);
EastWestYellow = 0;
NorthSouthGreen = 1;
timeRemaining = 30;
} else {
NorthSouthGreen = 0;
NorthSouthYellow = 1;
delay10ms(50);
NorthSouthYellow = 0;
EastWestGreen = 1;
timeRemaining = 30;
}
}
}
}
}
```
注:以上程序仅供参考,实际应用中需要根据具体硬件和需求进行适当修改。